1121100111 has 36 divisors (see below), whose sum is σ = 1752277800. Its totient is φ = 688782528.

The previous prime is 1121100083. The next prime is 1121100119. The reversal of 1121100111 is 1110011211.

It is not a de Polignac number, because 1121100111 - 2⁷ = 1121099983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1121100093 and 1121100102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121100119) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 231705 + ... + 236493.

Almost surely, 2^1121100111 is an apocalyptic number.

1121100111 is a deficient number, since it is larger than the sum of its proper divisors (631177689).

1121100111 is a wasteful number, since it uses less digits than its factorization.

1121100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4888 (or 4848 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

The square root of 1121100111 is about 33482.8330790571. The cubic root of 1121100111 is about 1038.8387281444.

Adding to 1121100111 its reverse (1110011211), we get a palindrome (2231111322).

Subtracting from 1121100111 its reverse (1110011211), we obtain a square (11088900 = 3330²).

It can be divided in two parts, 1121100 and 111, that added together give a palindrome (1121211).

The spelling of 1121100111 in words is "one billion, one hundred twenty-one million, one hundred thousand, one hundred eleven".